Rework base/job/drop rate related command: make it possible to set drop rates, disentangle job rate from base xp rate
Only basic tests done thus far:
@droprate 1
makes all bats drop nothing most of the time
@droprate 300
makes all bats drop roughly everything
@droprate 500000
gives me a mush hat on 10th red shroom.
This is odd, why does @exprate 0 not work?
Someone could have a second look into drop rate multiplier implementation, I haven't thought it out fully.